Microseismic Monitoring and Geomechanical Modelling of CO2 - bris
Microseismic Monitoring and Geomechanical Modelling of CO2 - bris
Microseismic Monitoring and Geomechanical Modelling of CO2 - bris
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2<br />
3<br />
3.5<br />
4<br />
5<br />
2<br />
1.8<br />
1.4<br />
4<br />
4.6. INTERPRETATION OF SHEAR WAVE SPLITTING RESULTS<br />
270°<br />
300°<br />
240°<br />
330°<br />
210°<br />
0°<br />
180°<br />
30°<br />
150°<br />
60°<br />
120°<br />
Anisotropy [%]<br />
90°<br />
10<br />
9<br />
8<br />
7<br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
0<br />
Fracture strike (α)<br />
180<br />
160<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
1<br />
1<br />
1.2<br />
1.6<br />
1.2<br />
1.4<br />
1<br />
1.8<br />
2<br />
2.5<br />
1.4<br />
1.4<br />
1.8<br />
1<br />
1.6<br />
1.2 1.2<br />
0<br />
0 0.05 0.1 0.15 0.2<br />
Fracture density (ξ)<br />
1<br />
1.4<br />
1.4<br />
1.2 1.2<br />
1.61.6<br />
2<br />
1.8<br />
2<br />
2.5<br />
1.8<br />
2.5<br />
6<br />
3<br />
2<br />
1.8<br />
1<br />
3<br />
1.6<br />
8<br />
2<br />
3.5<br />
3.5<br />
2.5<br />
1.8<br />
4<br />
3<br />
2.5<br />
3.5<br />
4 5<br />
4<br />
6<br />
8<br />
10<br />
5<br />
(a)<br />
γ<br />
0.2<br />
0.18<br />
0.16<br />
0.14<br />
0.12<br />
0.1<br />
0.08<br />
0.06<br />
0.04<br />
0.02<br />
6 6 6<br />
5 5 5<br />
4<br />
4<br />
3.5<br />
3.5<br />
3<br />
3<br />
2.5<br />
3<br />
2.5<br />
2.5<br />
1.6 1.6 1.6<br />
1.2<br />
1.4 1.4 1.4<br />
1<br />
1<br />
1.2<br />
1.2 1.2<br />
1.4<br />
1.6<br />
10 10 10<br />
8 8 8<br />
2 2 2<br />
1.8 1.8 1.8<br />
1.4<br />
1.6<br />
0<br />
0 0.05 0.1 0.15 0.2<br />
Fracture density (ξ)<br />
1.8<br />
1<br />
1<br />
1.2<br />
1.2<br />
1.4<br />
1.6<br />
1.8<br />
(b)<br />
0.2<br />
8<br />
4<br />
3.5<br />
(c)<br />
0.18<br />
0.16<br />
6<br />
5<br />
3.5<br />
2<br />
2.5<br />
3<br />
6<br />
5<br />
8<br />
10<br />
10<br />
8<br />
0.14<br />
4<br />
3<br />
0.12<br />
2.5<br />
4<br />
3.5<br />
6<br />
5<br />
3<br />
γ<br />
0.1<br />
2<br />
2<br />
2.5<br />
2<br />
1.8<br />
3<br />
2.5<br />
0.08<br />
1.8<br />
1.6<br />
1.4<br />
2<br />
1.8<br />
0.06<br />
1.2<br />
1.6<br />
1.6<br />
0.04<br />
0.02<br />
2<br />
1.8<br />
2.5<br />
3<br />
3.5<br />
5<br />
4<br />
2.5<br />
3<br />
0<br />
0 20 40 60 80 100 120 140 160 180<br />
Fracture Strike (α)<br />
6<br />
(d)<br />
Figure 4.24: SWS inversion results for the water injection stage, in the same format as Figure<br />
4.21. The inversion has accurately determined the fracture strike <strong>and</strong> sedimentary fabric strength.<br />
The fracture density is poorly constrained.<br />
2<br />
1.8<br />
1.4<br />
1<br />
1.6<br />
1.2<br />
1.8<br />
2<br />
79